Quote 4
"It's not your fault, darling. You said yourself that there was nothing else you could do." (20.35)
Dinah tries to comfort the Op when he expresses disgust with himself for having set the final cogs into motion that will lead to an explosion of violence. But it's hard to tell whether Dinah really believes what she's saying is true. The Op himself argues against Dinah's comment by insisting he could have done other plenty of other things. But instead he chooses to juggle death and murder.
Quote 5
"Money," she explained, "the more the better. I like it."
I became proverbial: "Money saved is money earned. I can save you money and grief."
"That doesn't mean anything to me," she said. (4.37)
It is comical how Dinah isn't at all embarrassed to sound completely mercenary. There's actually something refreshing about her frankness. She doesn't care if people think she's being materialistic. She is blunt almost to a fault.
Quote 6
"It's not so much the money. It's the principle of the thing. If a girl's got something that's worth selling to somebody, she's a boob if she doesn't collect." (4.66)
Dinah is constantly trying to sell information in exchange for cash. Here we see that Dinah thinks that you'd be a fool for not taking advantage of what you have to get what you want. It's interesting that the word "principles" is tied her, for Dinah, to the corruptive influence of money.